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Task for VM on ESXi 5.5 or 6.0 fails with "VDDK Error: 1"

KB ID: 1901
Product: Veeam Backup & Replication
Published: 2014-06-27
Last Modified: 2022-02-15
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Article Applicability

This article discusses an issue resolved in ESXi 5.5 Patch 08 and ESXi 6.0 Patch 03. 

If the error "VDDK error: 1 (Unknown error)." occurs with an ESXi host running a version more recent than ESXi 5.5 Patch 08 or ESXi 6.0 Patch 03, it is advisable to engage with both VMware support and Veeam support.

Challenge

A Backup or Replication job fails for a VM on an ESXi host running 5.x or 6.0 with an error specifying: 
VDDK error: 1 (Unknown error).

Cause

This issue occurs when too many performance counters are being registered on the ESXi hosts vpxa process causing the process to run out of memory.

Solution

According to VMware KB 2144799, this issue is resolved in ESXi 5.5 Patch 08 and ESXi 6.0 Patch 03.

If an upgrade is not an immediate option, the KB also outlines a workaround that does not persist through a reboot.
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